@QmlForeign

This decorator can be used to change the type that is created by QML.

This is useful for registering types that cannot be amended by adding the QmlElement decorator, for example because they belong to 3rdparty libraries.

QML_IMPORT_NAME = "com.library.name"
QML_IMPORT_MAJOR_VERSION = 1
QML_IMPORT_MINOR_VERSION = 0 # Optional

@QmlNamedElement("QWidget")
@QmlForeign(QWidget)
class ForeignWidgetHelperClass(QObject):
      ...

Afterwards the class may be used in QML:

import com.library.name 1.0

QWidget {
    // ...
}